title: Enhanced frequencies of CD14++CD16+, but not CD14+CD16+, peripheral blood monocytes in severe asthmatic patients.
abstract: CD16+ monocytes are expanded in various inflammatory conditions. Recently it was reported that CD16+ monocytes can be divided into two subsets with contrasting potential of modulating inflammatory responses, namely CD14++CD16+ and CD14+CD16+ monocytes. Here, we characterized and quantified CD14++CD16+ and CD14+CD16+ monocyte subsets in asthmatic patients in the context of severity of disease and different treatment options. Subjects included seventeen severe asthmatics and eighteen moderate asthmatics treated with moderate-to-high doses of inhaled glucocorticosteroids (GCS), twenty nine steroid-naive mild asthmatics and fifteen healthy controls. First, we demonstrated that CD14++CD16+ monocytes, in contrast to CD14+CD16+ monocytes, present significantly higher expression of anti-inflammatory molecule CD163. The frequency of CD14++CD16+, but not CD14+CD16+ monocytes, was significantly higher in patients with severe asthma as compared to mild and moderate asthmatics. However, the frequency of both CD16+ monocyte subsets did not correlate directly with exhaled nitric oxide levels. Short-term administration of oral GCS in patients with exacerbations resulted in a preferential decrease of CD14+CD16+ monocytes. Our study indicates that CD14++CD16+ and CD14+CD16+ monocyte subsets in asthmatics are differentially modulated by both the inflammatory process and GCS treatment.
authors.affiliation: Department of Allergology and Internal Medicine, Medical University of Bialystok, Sklodowskiej-Curie Street 24A, 15-276 Bialystok, Poland. moniuszm@umwb.edu.pl
authors.forename: Marcin
authors.initials: M
authors.lastname: Moniuszko
authors.forename: Anna
authors.initials: A
authors.lastname: Bodzenta-Lukaszyk
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Kowal
authors.forename: Danuta
authors.initials: D
authors.lastname: Lenczewska
authors.forename: Milena
authors.initials: M
authors.lastname: Dabrowska
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D015214:Antigens, Differentiation, Myelomonocytic / Q000378:metabolism; D001249:Asthma / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000187:drug effects; D005938:Glucocorticoids / Q000494:pharmacology; D006801:Humans; D007150:Immunohistochemistry; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000276:immunology*; D018950:Lipopolysaccharide Receptors / Q000276:immunology*; D008297:Male; D008775:Methylprednisolone / Q000494:pharmacology; D008875:Middle Aged; D009569:Nitric Oxide / Q000032:analysis; D011956:Receptors, Cell Surface / Q000378:metabolism; D017452:Receptors, IgG / Q000276:immunology*; D012720:Severity of Illness Index; D000098902:CD163 Antigen
chemical_list: D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D000098902:CD163 Antigen; D005938:Glucocorticoids; D018950:Lipopolysaccharide Receptors; D011956:Receptors, Cell Surface; D017452:Receptors, IgG; D009569:Nitric Oxide; D008775:Methylprednisolone